Fastening device for electrotypes.



0.1; THOMSON,

, FASTENING DEVICE FOR ELECTROTYPES.

. APPLICATION FILED ]AN.14 1915- 1,139,335, Patented May n Y B, m 4 I mf 5 3 M 1 M w I D W x x f MW 1 B d UNITED srarns PATENT OFFICE.

CHARLES J. THOMSON, OIIPIVI-IILADELPHIA, PENNSYLVANIA.

FASTENING DEVICE FOR ELEGTROTYPES.

Specification of Letters Patent.

Patented May 18, 1915.

I Application filed January 14, 1915. Serial No. 2,099.

To all whom it may concern:

Be it kn wnthat I, CHARLES J. THOMSON, a citizen ofthe United States ofAmerica,

residing in the city and county of Phi1adel-.

types or other printing platgzsi to th. or other plate supporting minherit? printing presses. 1

The various features of novelty which characteris'ge Iny invention arepointed out with particularity in the claims annexed to and forming apar} of this specification.

For a better undershrhding of the invention,

however, and of the advantages had-with it,

reference should be to the accompanying drawings and descriptive matterm which I have illustratedand described a preferred embodiment of myinvention.

Of the drawings: Figrjre 1 is a plan View of a portion. of .thecylinder-of a printing press on'whlch my inve tion is employed.

Figs. '2 and 3 are part al sectional elevations taken respectively; onthe lines 2'-2 and 3-3. of, and on a; larger scale than Fig. 1. Fig. 4.is a perspective View of my novel fastening device.

In the drawings, A represents the body of a well known type'of printingpress cylinder or cylinder segment. The cylinder A is formed with undercut peripheral slots A extending parallel to the axis of the cylinder.In the actual type of construction illustrated these slots are formed bythe spaces between I-bars B each of whichhas its base received, andcalked in a corresponding longitudinal groove A in the cast'metal body"portion of the cylinder A. 1

C represents in electrotype or similar plate which is eta'chably securedagainst the cylinder A by means of mynoveffastening devices I). Eachfastening device D, in the form shown, comprises a body portion d of athickness to fit easily between the adjacent edges of the outer flangesB of an adjacent pair of rails B. The body portion (5 of the fasteningdevice is provided at one end with a laterally enlarged head 03,

the lateral trunnion like extensions d of which bear against the innersides of the corresponding flanges B. To the opposite end of the bodyportion at of the fastening device is secured a spring clip D which, as

shown, is U shaped. The legs of the clip D enters the slots A at theopposite sides of the slot A receiving the body portion d of thefastening device. As shown, the legs of the spring clip D engage andgrip the corresponding flanges B, as shown best in Fig.2. Between itsends the portion (1 is formed with a finger a? which when the fasteningdevice is employed asshown in the drawings, bears against the outer sideof the reduced flange, or ed e of the plate C, and thereby clamps theatter against the support A. w

In the use of the improved fastening device, the head d is first enteredin thecorresponding slot A with the trunnions d -e2ktending parallel tothe length of the slot, as

' shown in Fig. 2. The fastening device is then given a quarter turn tobring the part d into the position in which its plane is radial withrespect to the cylinder A,"an d the device is then moved into theposition shown in dotted lines in Fig. 3, in which the finger 03 extendsover the flange C of the plate C, and the body d extends'at an angle tothe axis of the cylinder A. The fastening device is then secured inplaceby pressing the outer end of the body d'inward until the body d extendsgenerally parallel to the length of the axis of cylinder -A as'shown infull lines in Fig. 3. The fastening device is yieldingly held in thisposition by the in turned edges of the spring clip D which bear.against, and curl under the remote edges of the flanges B of therails Bbetween which the body portion d of the fastening device is. received.

As the fastening devicetis moved from the dotted line position ofv Fig.3 into the full line position of that figure, the part (Z forms a loverof the second class with the fulcrum the portions of the flanges Bengaged by the lateral extensions 03*. The leverage thus had makes itreadily feasible for the fastening devices to be moved into place by thefingers of the operator and Increases the effectiveness of the springclips D as holding devices. v

To permit of the rotation of the member (Z from the dotted to the fullline positions areinturned to better of Fig. 2, the member isadvantageously vious, however, that my invention does not depend on howthe tlifiercnt parts of the fastening device are connected together; oron Whether the device is made of several parts secured together, or inone integral piece. It is desirable, however, that the spring clipportion B should possess considerable resiliency and I prefer, also thatthe finger (.Z, and. the portion of the member 61 between the finger (Zand head (Z should possess some resiliency. and the fastoning device asa whole may advantageously be made out of Wrought steel.

.ln the use of my device to secure an electrotype or other plate inplace, as many fastening devices may be employed are necessary for thepnr iose. comparatively small plate in place, our fastening devices. oneengaging the plate adjacent each corner as shown in Finn-1, are ample.With larger plates more than two fastening devices at each side edgewill ordinarily be employed.

While in accordance with the provisions of the statutes, 1 have hereindescribed and illustrated the best :Forindoif my invention now known tome, it will be apparent to tliose skilled in the art that-changes can bemade in the form of my invention with out departing" from its spirit,and that some features of my invention can be used in some cases Withouta corresponding use of other features of the invention.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. A plate fastening device of the kind specified comprising; a bodyportion provided with a laterallyenl'arged head-at one end, and at theother end With. a spring clip and having a finger extendingfrom saidbody portion in a direction generally parallel to the length of thelatter from a point In securing a messes intermediate its ends, saidlinger being se gn arated from said body portion by plate receivingspace and being adapted to bear against the side of a plate i sorted inspace at some distance from theinserted edge of said plate.

2. In combination with a support formed a with an undercut groove, of adevice for upper side of said plate at some distance from its margin andpress said. plate directly toward said support.

3. in a printing press, the combination with a support formed withparallel under cut grooves, of device for securing a plate against saidsupport conqn'ising a body portion having laterally enlarged headadapted to be inserted in. one of said grooves When the lateralenlargements of said head extend parallel to the length of the grooveand to be rotated with said head so inserted to bring said lateral.enlargemerits trai'isvcrse to the length of the groove, said lateralenlargements being then adapted to bear against the inner edges of theunder cut Walls of the groove to prevent the removal therefrom of saidhead, a spring clip secured to the opposite end of said head from saidbody portion and ha in portions adapted to enter the grooves at theopposite sides of the groove at which said head is entered to yieldinglyhold the corresponding end of said body portion against movement outwardfrom said portion, said body portion bein finger projecting from itbetween its ends and adapted to lie or bear against the side edge ofsaid plate to thereby hold the latter against said support.

CHARLES .l. 'lliOlllSlllll. [L- fi l Witnesses Auivow Kara, i). STEWART.

.9, formed with a

